Recent advances in syntheses, properties and applications of TiO 2 nanostructures

Kulkarni

et al. 2020

The interaction of metal oxide nanoparticles (NPs) with cells and lipid bilayers is precarious in various fields such as antibacterial and drug or gene delivery. These require a strong control over NPs-cell interactions, an understanding of how the NPs surface impact their interaction with lipid bilayers and cells. Therefore, to elucidate Titanium dioxide (TiO 2 ) NPs of size 8-10 nm and 90-100 nm and their interaction with lipid bilayer of Escherichia coli and Staphylococcus aureus, we studied membrane potential, membrane permeability. Results of the traditional method of checking antibacterial activity -minimum inhibitory concentration (MIC) was co-related with change in membrane potential and membrane permeability. TiO 2 NPs 8-10 nm have profound action on depolarization of membrane potential of E. coli cells, while of S. aureus were not affected. TiO 2 NPs 90-100 nm have very less effect on membrane potential and permeability of both organisms. It is observed that there exists a strong co-relation between antibacterial activity of the TiO 2 NPs and change in the membrane potential and membrane permeability. These observations are also supported by membrane leakage test by estimation of protein, deoxyribonucleic acid (DNA) and potassium ion (K + ) ion content.

Section: Introductionmentioning

confidence: 99%

Study to elucidate effect of titanium dioxide nanoparticles on bacterial membrane potential and membrane permeability

Kulkarni

et al. 2020

“…Among the available metal oxides, TiO 2 is one of the best materials in the field of medical electronics due to their properties such as nontoxic, biocompatible, chemically stable, high band gap, high dielectric constant and inexpensive [3]. In addition to that, TiO 2 has also unique physical, chemical and electronic properties [4]. The TiO 2 nanoparticles belong to transition metal oxides family.…”

Section: Introductionmentioning

confidence: 99%

“…The TiO 2 nanoparticles belong to transition metal oxides family. The naturally occurring TiO 2 crystal has three polymorphs (phases) namely rutile, anatase and brookite [4]. Among those polymorphs rutile and anatase have wider application but rutile is the most stable than both anatase and brookite at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Structural, optical and conductivity study of hydrothermally synthesized TiO₂ nanorods

Kumar

Yesappa

2020

TiO 2 nanorods are synthesized by hydrothermal method using the commercially available TiO 2 nanopowder (P25) as a precursor. This work mainly focused on the study of the various properties and comparison among the P25, 20 mg TiO 2 nanorods and 40 mg TiO 2 nanorods by different characterizations. Fourier Transform Infrared Spectroscopy (FTIR) was carried out and the results confirmed the formation and presence of TiO 2 nanorods by shifting peak positions from 1433 cm −1 to 1424cm −1 and 1420cm −1 . The x-ray diffraction (XRD) results indicate that the crystallinity of TiO 2 nanorods increased significantly and was confirmed by the variation in the diffraction peak intensity and the peak at 2θ=25.23°is conformed the anatase phase. The Field Emission Scanning Electron Microscope (FESEM) images clearly show the formation and presence of TiO 2 nanorods. Thermogravimetric Analysis (TGA) and Differential Thermal Analysis (DTA) reveal that increasing in thermal stability and differential scanning calorimeter (DSC) evaluates the increase in melting temperature of TiO 2 nanorods. The UV-vis absorption spectra show the absorption peak redshift towards higher wavelength and it leads to expansion of optical activities of TiO 2 nanorods. The optical band gap energy was found to be decreased to 5.3, 5.2 and 4.9 eV for P25, 20 and 40 mg respectively. The dielectric constant has increased twice and the dielectric loss by almost ten times compared to dielectric constant and dielectric loss of the P25. The current versus voltage (I-V) characteristics show the linear curve which reveals the easy flow of current is more in TiO 2 nanorods. From the obtained results, it could be concluded that TiO 2 nanorods are suitable for potential applications.

“…The preference of adsoption is due to its simplicity, efficiency at very low concentrations, and economical properties [16,17]. For instance, nanostructured TiO 2 ,due to its chemical stability, versatility, effectiveness, and cheapness, is well known as a reliable and efficient heavy metal adsorbent [18,19]. As another example, carbon-based nanomaterials, (e.g.…”

Section: Introductionmentioning

confidence: 99%

A novel synthesis of TiO₂/GO nanocomposite for the uptake of Pb²⁺ and Cd²⁺ from wastewater

Siddeeg

2020

Ionic liquids attract attention in the last years due to its powerful solvation properties. For this reason, in current study 1-ethyl-3-methylimidazolium tetrafluoroborate [EMIM-BF 4 ] ILs was used for the synthesis of high surface TiO 2 /GO nanocomposite, as an active material for heavy metal removal from aqueous media. FT-IR, transmission electron microscopy (TEM), scanning electron microscope (SEM), and x-ray diffraction (XRD) techniques were employed for identification of the novel nanocomposite. Batch experiments were conducted for Cd +2 and Pb +2 uptake from wastewater by the synthesized nanocomposite. The effect of parameters affecting adsorption capicity, such as contact time, pH, nanocomposite dosage and the initial concentration of heavy metals were examined for Cd +2 and Pb +2 removal by the prepared nanocomposite. The removal efficiency of Cd +2 and Pb +2 was 69.36% and 89%, respectively, under optimal conditions confirming the ability to use the prepared nanocomposite for wastewater treatment from heavy metals with high efficiency.